Revert of Delete base/prefs and update callers to use components.

components/prefs/pref_service_factory.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/prefs/pref_service_factory.h"
 
 #include "base/bind.h"
 #include "base/sequenced_task_runner.h"
 #include "components/prefs/default_pref_store.h"
 #include "components/prefs/json_pref_store.h"
 #include "components/prefs/pref_filter.h"
 #include "components/prefs/pref_notifier_impl.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/pref_value_store.h"
 
+namespace base {
+
 namespace {
 
 // Do-nothing default implementation.
 void DoNothingHandleReadError(PersistentPrefStore::PrefReadError error) {
 }
 
 }  // namespace
 
 PrefServiceFactory::PrefServiceFactory()
     : managed_prefs_(NULL),
@@ skipping 26 matching lines @@
                                          user_prefs_.get(),
                                          recommended_prefs_.get(),
                                          pref_registry->defaults().get(),
                                          pref_notifier),
                       user_prefs_.get(),
                       pref_registry,
                       read_error_callback_,
                       async_));
   return pref_service;
 }
+
+}  // namespace base